FPCN39 CWLW 161400
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PDT FRIDAY 16 APRIL 1999 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   SPOK     41   14     900   5    100   25    3000   7
KAMLOOPS     SPOK     34   12     900   5     89   22    2250   7
OKANAGAN     SPOK     28   10     850   4     74   20    1700   7
CASTLEGAR    SPOK     23    9     850   4     74   19    1850   7
CRANBROOK    SPOK      9    7     950   6     82   17    2350   8
REVELSTOKE   SPOK     23    8     800   4     67   18    1800   6

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   S   15   SW  20
CRANBROOK             VR   5   NW  15

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: FAIR

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.      9    9     950  12     64   19    1550  12
PR. GEORGE   P.G.     27    8     850  11     95   17    1900  13
SMITHERS     P.G.     25    9     850   5     83   18    1650  11
WELLS GRAY   P.G.      9    9     950  12     60   19    1550  12
FT NLSN      F.N.      9    7     400   3     22   14     650   5
FT STJOHN    F.N.      9   11     700  13     82   16    1650  12

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   15   SW  19
SMITHERS              VR   5   SW  19

TODAY'S VENTING: GOOD LOCALLY POOR

VENTING FOR SATURDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   11     100   9     25   16     250   9
FRASER VLY   QUIL     28   17     300   9    100   26    1450  17
SRN VRISL    QUIL     16   13     150   6     38   21     350  10
CNTRL VRISL  QUIL     14   12     100   6     38   21     350  10
NRN VRISL    HRDY     13   10     150   3     23   16     300   5
TERRACE      ANT      14   10     300   7     63   16    1500   6
STEWART      ANT      22    9     200   8     59   16    1000   7

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  22   S   24   SW  24
PORT HARDY   SE  17   S   22   S   20
SANDSPIT     SE  35   S   24   S   20

TODAY'S VENTING: POOR LOCALLY GOOD INLAND IN THE SOUTH. GOOD NORTH.

VENTING FOR SATURDAY: FAIR TO POOR

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


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